Abstract: In order to study the effect of the nozzle arrangement on the dust removal efficiency by water-cloud，the experimental platform which was made up of dust making system，mist supple system and test system was designed.Experiments on different nozzle arrangements were carried out to obtain the effect of the mist pressure and the nozzle arrangement on the dust removal efficiency.With the mist pressure increasing，the dust removing efficiency improved.But when the mist pressure was over 1.6MPa，and the increasing of speed was becoming slow.Under different pressure，the dust removal efficiency of double nozzles is better than that of single nozzle.The longer distance between nozzle and dust resource，the higher the dust capture efficiency is，but the lower the respirable dust capture efficiency is.

Key words: Nozzle, Arrangement, Dust removal efficiency, Water-cloud